WHAT IS THE DIGI-RTU South 59 th Street Omaha, NE bes-tech.net

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1 Digi-RTU

2 WHAT IS THE DIGI-RTU The Digi-RTU is a Heating, Ventilation, and Air Conditioning (HVAC) rooftop unit control kit that is both a demand management and energy usage device. It is designed to improve the energy efficiency and demand requirements of a rooftop unit as well as solve the humidity, common noise, and frequent on/off issues of a rooftop unit through modulating the capacity of a rooftop unit to match the cooling or heating space requirements.

3 DIGI-RTU PERFORMANCE RECOGNITION American Public Power Association s 2011 DEED Energy Innovator Award.

4 HOW THE DIGI-RTU WORKS By intercepting heating and cooling calls, the Digi-RTU s patented technology manages the compressor and fan speeds to match the space requirements. As a result space temperature and humidity are best managed. Digi-RTU Kit 4-5 hour install time

5 DIGI-RTU ENERGY PERFORMANCE: EER With Digi-RTU Without Digi-RTU Improve RTU seasonal performance over 30%

6 DIGI-RTU ROOFTOP ADVANCED CONTROLS - Integrates air-side economizers - Controls supply fan speed (VAF) - Controls Compressor capacity (VRF) - Manages Demand-Controlled Ventilation, CO2 - Demand Response signal enabled (DR) - Fault Detection & Diagnostic (FDD) - Remote Monitoring & Control

7 MAIN APPLICATIONS Package rooftop units, water and air source heat-pumps, split units HVAC rooftop units between 3 to 50-ton Up to four cooling stages Up to two heating stages Scroll compressors & reciprocating compressors All original equipment rooftop units Thermostat and BMS interfaces

8 DIGI-RTU ADVANCED CONTROLS FUNCTION Modulating mechanical HVAC equipment matches space operating requirements and is an accepted industry standard Modulating fan and compressor is the energy efficiency strategy for rooftop units in all climate zones Economizer Integration Integration and management of the existing economizer Extends existing economizer range by 30% Fan Speed Control - VAV ON mode - average fan savings are greater than 85% AUTO mode - average fan savings are 70 80% Demand Controlled Ventilation, CO2 CO 2 sensor in the return-air duct integrated with the economizer meets ASHRAE 62.1 and CA Title 24 IAQ

9 DIGI-RTU ADVANCED CONTROLS FUNCTION Demand Response Digi-RTU responds to all space heating /cooling calls according to establish set-points Prior notice of a Demand Event, the Digi-RTU can pre-cool the space and then maintain established space temperature per set-points of the BMS A Load-Limit factor for the rooftop unit is sent through the BAS to the Digi-RTU, and can range from %, thereby limiting the speed of the rooftop unit. kw Reductions Are Not Achieved by Adjusting Up Space Set-Points

10 FAULT DETECTION & DIAGNOSTICS (FDD) continued communication, data collection, and visibility with existing building strategies Monitoring & Alerts cloud storage & retrieval Insufficient evaporator air-flow Condenser coil fouling Low/high refrigerant charge Compressor valve leakage IP T-stat Liquid line restrictions Economizer damper failure existing BMS & database server Building Gateway 3 rd Party Monitoring Sensor failure/degradation

11 REMOTE MONITORING & CONTROL continued communication, data collection, and visibility with existing building strategies Remote Monitoring & Control existing BMS & database server Building Gateway Building Gateway 3 rd Party Monitoring kwh consumption kw Temperature and Set-point VFD speed Damper position Space CO2 level Any time measurement periods HVAC unit OFF

12 DIGI-RTU ADVANCED CONTROLS FUNCTION Existing Building EE Strategies, Platform & Equipment Communicates with existing BAS platforms and existing installed thermostats; programmable, IP etc. Integrates with the original equipment HVAC controller Mounts inside the HVAC rooftop unit Compressor Optimization - VRV Conforms to original equipment manufacturer recommendations for speed reduction down to 45Hz Programmed logic provides soft start & stop of the compressor Compressor modulation savings are double fan power savings for a significant portions of the climate zones Peak Demand savings of 4 5kW for an average 10-ton rooftop

13 DIGI-RTU 3 RD PARTY FINANCING Equipment loan/lease Performance contract shared savings HVAC as a Service equipment and service financing On-bill financing

14 BENEFITS OF USING A DIGI-RTU Sustainable reduction in electricity and therm consumption Reduces peak demand and associated peak demand charges Integrates with existing space temperature management devices Better maintains space humidity and temperature decreasing comfort complaints Reduces compressor cycling up to 75%, reducing maintenance costs Reduces HVAC equipment noise in occupied space Applicable kw, kwh, Demand Response, Fault Detection and VFD utility incentive programs Available financing options

15 OMAHA, NE

16 DIGI-RTU CASE STUDY DISTRIBUTION CENTER / /18 11/17 12/17 1/16 2/15 3/17 4/16 Date Without Digi-RTU With Digi-RTU 5/16 OAT (F) Power (kw) 70 71% kw decrease Measured RTU Power Pre - blue Post - red Ambient temperature 5-minute intervals OAT Measured Power Consumption and Ambient Temperature 4640 South 59th Street Omaha, NE 68117

17 Power (kw) DIGI-RTU CASE STUDY DISTRIBUTION CENTER OAT Without Digi-RTU With Digi-RTU 85% kwh decrease Measured RTU Power Pre blue Post red 5-minute intervals Comparison of Measured Power Consumption with and without Digi-RTU

18 SAN DIEGO

19 DIGI-RTU CASE STUDY OFFICE SPACE February - March % kw decrease Pre blue line Post green line Ambient temperature red line Measured RTU Power for One Minute Interval

20 DIGI-RTU CASE STUDY OFFICE SPACE February - March % kwh decrease Pre blue line Post green line Daily Electrical Energy Consumption; Pre (blue ) and Post (red ) vs. Ambient Temperature

21 SAN ANTONIO TX

22 8/27 8/28 8/29 8/30 8/31 9/1 9/2 9/3 9/4 9/5 9/6 9/7 9/8 9/9 9/10 9/11 9/12 9/13 9/14 9/15 9/16 9/17 9/18 9/19 9/20 9/21 9/22 9/23 9/24 9/25 9/26 9/27 9/28 9/29 9/30 10/1 10/2 10/3 10/4 10/5 10/6 10/7 kw OAT, Deg F SEPTEMBER OCTOBER 2012 BOX RETAIL Two weeks with and two weeks without Before After AVG-OAT 29.5% kw decrease

23 kwh DIGI-RTU INSTALL ASHRAE #2 BIG BOX RETAIL Two days with and two days without 74% kwh reduction 9/23/12 (OAT = 78 F; weekend; after install) 9/26/12 (OAT = 80 F; weekday; after install) 9/9/12 (OAT =79 F; weenkend; before install) 9/11/12 (OAT = 79 F; weekday; before install)

24 VERMONT

25 kwh Avg. OAT BURLINGTON ELECTRIC STUDY Office Building Without Optimizer With Optimizer 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 Metered Savings = 65% W/O Digi-RTU With Digi-RTU Aug 9-Aug 14-Aug 19-Aug 24-Aug 29-Aug 3-Sep 8-Sep Date 65% kwh reduction - Equipment sub-metered - Two weeks pre - Two weeks post - IPMVP *Efficiency Vermont press release

26 kwh 20-Sep 22-Sep 24-Sep 26-Sep 28-Sep 30-Sep 2-Oct 4-Oct 6-Oct 8-Oct 10-Oct 12-Oct 14-Oct 16-Oct 18-Oct Avg. OAT EFFICIENCY VERMONT - STUDY Distribution Center 70,000 Metered Savings = 68% Without Optimizer With Optimizer 60,000 50,000 40,000 30,000 20,000 10,000 0 W/O Digi-RTU With Digi-RTU 68% kwh reduction - Equipment sub-metered - Two weeks pre - Two weeks post - IPMVP *Efficiency Vermont press release